Buteo polyosoma and B. poecilochrous, the "red-backed buzzards" of South America, are conspecific

Article Abstract:

Wing length, Stresemann's wing formula, plumage morphs and adult female vocalizations are not enough to enable the separation of Buteo peocilochrous from B. polyosoma. Since these species are morphologically similar and their taxonomic characters are suggestive of conspecificity, the name poecilochrous should be treated synonymous with polyosoma and thus applied to all forms in this group. The English name 'red-backed buzzard' must also be changed to 'variable buzzard' since many of the group's adults do not possess red backs.

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Individual and intersexual variation in alarm calls of the White-tailed Hawk

Article Abstract:

The individual andintersexual variations in the vocalizations of White-tailed hawks were studied.Alarm calls from six resident breeding adult hawks at the Attwater Prairie Chicken National Wildlife Refuge were recorded for a duration of five days. Sonograms of the recorded calls are then generated and measured using a computer software package. Results reveal strong variations in the individual and intersexual calls of the White-tailed Hawks.

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Nonrandom mating and productivity of adult and subadult Cooper's hawks

Article Abstract:

Research describing pair formation in Cooper's Hawks (Accipiter cooperii) is presented. In particular the breeding success of adult and subadult mixed and non-mixed pairs is investigated.

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